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Chapter 6 Vocabulary
Mr McMillen's Physical Science
19
Science
9th Grade
10/01/2007

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Term
reactant
Definition
a substance or molecule that participates in a chemical reaction
Term
product
Definition
a substance that forms in a chemical reaction
Term
chemical energy
Definition
the energy released when a chemical compound reacts to produce new compounds
Term
exothermic reaction
Definition
a chemical reaction on which heat is released to the surroundings
Term
endothermic reaction
Definition
a chemical reaction that requires heat
Term
synthesis reaction
Definition
a reaction in which substances combine to form a new compound
Term
decomposition reactions
Definition
a reaction in which a single compound breaks down to form two or more simpler reactions
Term
electrolysis
Definition
the process in which an electric current is used to produce a chemical reaction, such as the decomposition of water
Term
combustion reaction
Definition
the oxidation reaction of an organic reaction, in which heat is released
Term
single-displacement reaction
Definition
a reaction in which one element or radical takes place of another or radical in a compound
Term
double-displacement reaction
Definition
a reaction in which a gas, a solid precipitate, or a molecule compound forms from the apparent exchange of atoms or ions between two compounds
Term
oxidation-reduction reaction
Definition
any chemical change in which one species is oxidatized (loses electrons) and another species is reduced (gains electrons); also called redux reaction
Term
radicals
Definition
an organic group that has one or more electrons available for bonding
Term
chemical equation
Definition
a representation of a chemical equation that uses symbols to show the relationship between the reactants
Term
mole ratios
Definition
the relative number of moles of the substances required to produce a given amount of product in a chemical reaction
Term
catalysts
Definition
a substance that changes the rate of a chemical equation without being consumed or changed significantly
Term
enzymes
Definition
a type of protein that speeds up metabolic reactions in plants and animals without being permanently changed or destroyed
Term
substrate
Definition
the reactant in reactions catalyzed by enyzymes
Term
chemical equilibrium
Definition
a state of balance in which the rate of a forward reaction equals the rate of a reverse reaction and the concentration of products and reactants remain unchanged
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